About demjson and jsonlint

The demjson package is a comprehensive Python language
library to read and write
JSON;
the popular language-independent data format standard.

It includes a command tool, jsonlint, that allows you to
easily check and validate any JSON document, and spot any potential
data portability issues. It can also reformat and re-indent a JSON
document to make it easier to read.

License

This is Free Software, licensed under the terms of the
GNU LGPL
version 3 or later.

This basically means you are completely free to use it however you
want (even in proprietary systems) for any purpose. However, if you
make modifications to it and you redistribute it to others,
then you must make your modifications to this software public and
also release it under the same license terms. Read the license text for
all the details.

Older versions may have been released under a different license;
be sure to read the LICENSE.txt file that is included in each package.